Anthropic IPO: What active managers are watching

Key takeaways

• Anthropic's anticipated IPO could test investor appetite for mega listings, as valuation expectations and offering size influence demand.
• Anthropic's rapid revenue growth strengthens its investment case, but questions remain about whether that momentum can support a potential $1.5 to $2 trillion valuation.
• Anthropic's substantial AI infrastructure spending raises questions about how quickly revenue growth can translate into sustainable profitability and returns on capital.
• The arrival of Anthropic and other mega IPOs could deepen concentration in growth benchmarks, making portfolio positioning and benchmark alignment increasingly consequential for active managers.
• Strong demand for high-profile IPOs may complicate portfolio implementation, as limited initial allocations could force managers to establish positions at higher prices in the secondary market.

Anthropic's long-awaited IPO prospectus was filed on Monday, October 26, and the numbers offer a remarkable look at the scale of the AI boom. The five-year-old company reported $16.3 billion in revenue for the first half of 2026, almost 14 times the amount generated a year earlier. ¹ Existing investors now expect the company to seek a valuation between $1.5 and $1.75 trillion, below the $2 trillion some investors had anticipated in August.

Source: Official: https://www.sec.gov/Archives/edgar/data/2130357/000162828026067168/anthropicpbc-sx1.htm#ica694c859b8e458dbf6a73f56dde9d42_2979

At that valuation, Anthropic would rank alongside the largest companies to enter public markets. Anthropic is now preparing to become the second mega IPO of 2026 after SpaceX, with plans to trade on Nasdaq under the ticker ANT. The company has not yet announced a final offering price or listing date but is expected to list after the U.S. midterm elections on November 3 and before the Thanksgiving holiday on November 26.

The timing is interesting. After years of enormous investment in AI infrastructure, investors are asking tougher questions about how much of that spending will translate into profits. Anthropic's filing puts some numbers behind that debate, including nearly $9 billion in computing and infrastructure expenses in the first half of the year.

As we explored in our analysis of what the SpaceX IPO revealed, the arrival of these enormous private companies creates new questions for public-market investors, from valuation and trading liquidity to portfolio concentration.

We've been speaking with active equity managers about how they're assessing Anthropic ahead of its anticipated listing. Their views reveal considerable interest in the company's growth potential, alongside important questions about valuation, profitability, governance and portfolio construction.

Managers see significant growth potential in Anthropic, but questions remain about how much investors should be willing to pay for it. The company was valued at approximately $965 billion in its latest private funding round in May, while estimates for its potential IPO valuation were at one point as high as $2 trillion. The company's five largest customers accounted for approximately 25% of revenue in the first half of 2026, highlighting the potential risks of customer concentration. Some managers are also questioning whether the company's rapid revenue growth can continue at a pace that justifies a valuation approaching $2 trillion.

Others see a lower IPO valuation as an opportunity. The size of the offering could also influence pricing, as a larger capital raise may require a discount to attract sufficient investor demand. One manager with existing private-market exposure expressed confidence in Anthropic's technology and commercial prospects, particularly as the company develops applications in industries such as healthcare.

Managers are examining the financial disclosures and developing independent valuation models. The durability of revenue growth, customer concentration, competitive position, and offering price will help determine whether they see an attractive investment opportunity.

Anthropic's financial disclosures reveal the enormous expense of developing and operating advanced AI models. The company has outlined plans for nearly $800 billion in spending commitments over the coming decade, highlighting the scale of investment required to develop and operate its AI models.

Managers are assessing how that investment translates into future earnings. Anthropic's substantial research and model development costs weigh on current profitability, while commercial applications in areas such as healthcare may take time to generate meaningful revenue. This complicates valuation calculations, as current expenses precede the revenue opportunities they are intended to support.

Across our global equity research universe, a broader debate is emerging about AI's economics. Falling inference costs could accelerate adoption while putting pressure on model providers' pricing power. Managers are increasingly focused on which companies can turn AI investment into sustainable earnings and attractive returns on capital.

The implications of Anthropic's listing extend beyond its share price. Technology already accounts for a substantial share of growth benchmarks, and another generation of mega IPOs could increase concentration further.

SpaceX, Anthropic and OpenAI could collectively account for approximately 3% of the Russell 1000 and 5.6% of the Russell 1000 Growth Index by early 2028 as their publicly available shares increase. That would make decisions about owning or avoiding these companies increasingly consequential for active managers.

The broader AI opportunity set is also changing. Our latest manager research points to growing interest in networking, electrical equipment, automation, cybersecurity and enterprise software, alongside AI supply-chain companies in Taiwan, Korea and Japan.

Growing exposure to a handful of companies raises important questions about diversification. Managers are looking across sectors and markets for companies with attractive valuations, sustainable earnings and differentiated sources of growth.

SpaceX demonstrated how difficult it can be to establish meaningful positions in highly anticipated IPOs. The company attracted more than $70 billion in global retail orders, while limited initial share availability contributed to significant trading activity and price volatility in the first days and weeks following the IPO.

Initial allocations may be too small for managers to establish meaningful positions, leaving them needing to purchase additional shares in the secondary market at prices that can deviate significantly from the offering price. That makes the initial valuation and trading conditions particularly important.

The experience also highlighted the importance of liquidity and timing. Russell Investments' trading analysis found that 28.3% of technology share distributions were at or above their distribution price on day one, rising to 40.25% by day 30. Those differences can influence decisions about when to sell shares and how to manage concentrated positions.

Managers will be watching Anthropic's offering size, initial free float and trading conditions alongside its fundamentals. Several also expect the IPO filing to clarify governance questions, including the proposed public benefit fund and its potential implications for shareholder dilution. The proposed allocation of 5% of shares to the fund also raises questions about shareholder rights and whether future contributions could dilute existing investors.

Anthropic's anticipated IPO comes at an important point for AI investing. The market has rewarded companies building the infrastructure behind AI, but attention is turning to which businesses can convert that investment into sustainable earnings.

For active managers, Anthropic presents several decisions. Is the company's growth durable enough to support its valuation? How much capital will it need to compete? And how should investors manage exposure to another potentially trillion-dollar company in an already concentrated market?

SpaceX showed how quickly these listings can affect trading and portfolio exposures. Anthropic will provide another test of investor demand, with greater scrutiny of the underlying economics of AI.

The opportunity for active managers extends across companies supplying AI infrastructure, developing models and applying the technology to new industries. Understanding where profits ultimately accrue, and what investors are paying for them, will be central to portfolio decisions.

¹ https://www.ft.com/content/f6ecfecd-d797-4d2c-b427-d333297949cb?sharetype=blocked&syn-25a6b1a6=1